[1maginary]

I suspect what you're saying could definitely be a phenomenon. However, in this case, I think it's just a matter of domain and context.

I speak both English and Spanish natively, however, I'm more comfortable in English when talking about e.g. technology and music. On the other hand, I'm more comfortable in Spanish when talking about math, feelings, etc.

As you can probably already tell, it's not like math and feelings are very related. It's just that I've probably been more exposed to those things in Spanish than in English. Same goes for technology and music topics, I've just been exposed to them in English a lot more than in Spanish.

Btw, I also had to write a dissertation in Spanish and I, too, had trouble with it, hah.